Abstract
6-Vinylpurines readily undergo Diels-Alder reactions with dienes. Both reactivity and endo selectivity are greatly improved when the cycloadditions are performed in the presence of zinc chloride. Lewis acid mediated Diels-Alder reaction of 6-vinylpurine riboside was employed as a key step in the synthesis of a nucleoside with structural resemblance to potent A 1 adenosine agonists.
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